Instruction Sheet
IS-MA60/125/250
Issued: 3-6-18
Lowell Manufacturing Company
100 Integram Drive
Pacific, Missouri 63069 U.S.A.
Call: 800-325-9660
Fax: 636-257-6606
Click: www.lowellmfg.com
9
Connection to
three (3)
1/3 octave
equalizers using
Lowell PA250A
booster amplifiers
with similar and
different types of
loudspeakers.
(Similar speakers
are fed by
the same equalizer).
LO WELL
PA250A
BOOSTER
AMPLIFIER
Aux In
Jack
To Speakers
Note: Jumper cords shown
are not included.
Inside of MA60, MA125, or MA250 Chassis
INTERNAL
PO WER
AMPLIFIER
Power
Amp
In
RCA
Jack
To Speakers
Preamp Out
RCA Jacks
Remove Fact ory
Installed Jumper
Between Pre-Out
And Power Amp In
OPTI ONAL
1/3 OCTAVE
EQ UALIZER
BY OTHERS
¼”
High-Z
Input
¼”
High-Z
Output
Type 1
Type 2
LO WELL
PA250A
BO OSTER
AMPLIFIER
Aux In
Jack
To Speakers
LO WELL
PA250A
BOOSTER
AMPLIFIER
Aux In
Jack
To Speakers
Type 2
Type 3
OPTI ONAL
1/3 OCTAVE
EQ UALIZER
BY OTHERS
¼”
High-Z
Input
¼”
High-Z
Output
OPTI ONAL
1/3 OCTAVE
EQUALIZER
BY OTHERS
¼”
High-Z
Input
¼”
High-Z
Output
Connection to
One (1)
1/3 octave
equalizer using a
Lowell PA250A
booster amplifier
with similar
loudspeakers fed
by both amplifiers
LO WELL
PA250A
BO OSTER
AMPLIFIER
Aux In
Jack
To Speakers
Note: Jumper cords shown
are not included.
Inside of MA60, MA125, or MA250 Chassis
INTERNAL
POWER
AMPLIFIER
Power
Amp
In
RCA
Jack
To Speakers
Preamp Out
RCA Jacks
Remove Fact ory
Installed Jumper
Between Pre-Out
And Power Amp In
OPTI ONAL
1/3 OCTAVE
EQ UALIZER
BY OTHERS
¼”
High-Z
Input
¼”
High-Z
Output
Type 1
Type 1
Connection to
two (2)
1/3 octave
equalizers using
Lowell PA250A
booster amplifiers
with similar and different
types of loudspeakers.
(Note: Similar speakers
are fed by the
same equalizer).
LOWELL
PA250A
BO OSTER
AMPLIFIER
Aux In
Jack
To Speakers
Note: Jumper cords shown
are not included.
Inside of MA60, MA125, or MA250 Chassis
INTERNAL
POWER
AMPLIFIER
Power
Amp
In
RCA
Jack
To Speakers
Preamp Out
RCA Jacks
Remove Fact ory
Installed Jumper
Between Pre-Out
And Power Amp In
OPTI ONAL
1/3 OCTAVE
EQ UALIZER
BY OTHERS
¼”
High-Z
Input
¼”
High-Z
Output
OPTI ONAL
1/3 OCTAVE
EQ UALIZER
BY OTHERS
¼”
High-Z
Input
¼”
High-Z
Output
Type 1
Type 2
SPEAKER SYSTEM CONNECTIONS
The amplifier includes a speaker output screw terminal
strip.
Connect the speaker line common to “COM” and
the hot side to the 70V, 25V, 8
W
, or 4
W
terminals.
_
70V
25V
8
W
4W
COM
+
24V DC
INPUT
Never connect an 8
W
or 4
W
speaker system (that has no 70V or 25V matching transformers) to the 70V or 25V outputs.
Note: Lowell TSM-ISO transformers
(sold separately) may be required
instead of the jumper cords shown if
the ground loops created by the RCA
cords cause noise in the system.
Note: Lowell TSM-ISO transformers
(sold separately) may be required
instead of the jumper cords shown if
the ground loops created by the RCA
cords cause noise in the system.
Note: Lowell TSM-ISO
transformers (sold
separately) may be required
instead of the jumper cords
shown if the ground loops
created by the RCA cords
cause noise in the system.